Synthesis and physical identification of the isotope with mass number 260 of element 104

Флеров, Г.Н.; Oganesyan, Yu.Ts.; Lobanov, Yu. V.; Kuznetsov, V. S.; Druin, V.A.; Perelygin, V.P.; Gavrilov, K.A.; Tretyakova, S.P.; Plotko, V.M.

doi:10.1007/bf01116295

Cited by 24 publications

(7 citation statements)

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“…The three experimental points given for element 104 represent (r n /T/) av values estimated from the experimental cross section 18 for the production of a 0.3-sec SF emitter in the reaction between 242 Pu and 22 Ne, assuming a 3n y 4w, and Sn reaction, respectively. Comparison with the extrapolated T n /T f values using both Eqs.…”

Section: Empirical Formula For T N /Tfmentioning

confidence: 99%

Analysis of Excitation Functions inCm(C,xn)NoReactions

1968

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Section: Empirical Formula For T N /Tfmentioning

confidence: 99%

Analysis of Excitation Functions inCm(C,xn)NoReactions

1968

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“…Zvara et al [21,22] at the Joint Institute of Nuclear Research in Dubna developed an extremely fast on-line isothermal chromatographic method to study the volatility of Rf-chlorides on various column surfaces (stainless steel, teflon, glass). These experiments were designed to chemically identify an isotope of Rf decaying by spontaneous fission (SF) with a half-life of 0.3 s that was previously reported by a team of physicists at the same laboratory [23], and thus confirm the discovery of element 104. The existence of an isotope of Rf decaying by SF with a half-life of 0.3 s could not be confirmed, however [24].…”

Section: Introductionmentioning

confidence: 93%

On-line gas chromatographic studies of Rf, Zr, and Hf bromides

Sylwester¹,

Gregorich²,

Lee³

et al. 2000

Radiochimica Acta

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Chromatography / Isothermal / Volatility / Bromides / Adsorption Summary. The Heavy Element Volatility Instrument (HEVI), an on-line isothermal gas chromatography system, has been used to separate the volatile bromide compounds of the group 4 elements Zr and Hf and the transactinide Rf according to their volatilities, and to provide data on the gas phase chemical properties of very short-lived isotopes in amounts as low as a few atoms. For these studies 261 Rf was produced via the 248 Cm( 18 O, 5n) reaction. 165Ϫ167 Hf was produced via the reaction nat Eu( 19 F, xn), and 85 Zr was produced via the nat Cu( 28 Si, 3p3n) reaction. The half-life for 261 Rf was measured to be 75Ϯ7 seconds.A Monte Carlo code was used to deduce the enthalpy of adsorption (∆H a ) from the observed volatility and parameters of the chromatography system. The resulting adsorption enthalpies for the Zr, Hf, and Rf tetrabromides are:Ϫ108Ϯ 5 kJ · mol Ϫ1 , Ϫ113 Ϯ5 kJ · mol Ϫ1 and Ϫ87Ϯ 7 kJ · mol Ϫ1 , respectively.Volatilities of the group 4 bromides support the conclusion from previous results for the group 4 chlorides that Rf deviates from the trend expected by simple extrapolation of the properties of its lighter homologs in the periodic table. The group 4 bromides are also observed to be less volatile than their respective chlorides, as predicted by relativistic calculations.

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“…Element 104 (Rf) was discovered in 1964 at JINR when the irradiation of a 242 Pu target by 115-MeV 22 Ne ions produced the isotope 260 Rf (T ½ = 0.3 s) (Flerov et al 1964), whereas the element 105 (Db) was identified in 1971 at LBNL by reactions of highly energetic 18 O and 16 O beams with 249 Bk targets (Ghiorso et al 1971).…”

Section: Elements 104-118: the Discoveringmentioning

confidence: 99%

The periodic table of the elements: the search for transactinides and beyond

Terranova

Tavares

2022

Rend. Fis. Acc. Lincei

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The periodic table of Mendeleev, initially proposed on the basis of 66 elements, and containing 82 elements at the time of Moseley (1887–1915), describes nowadays 118 elements. The huge challenge of this scientific adventure was, and still is, the development of technologies and methods capable of producing elements of atomic number Z > 103, known as superheavy elements (SHE), or transactinides. This paper presents a survey of experiments and theoretical approaches that led physicists and chemists of today to discover and characterize a number of SHE isotopes. A glance is also given to the feasibility studies performed by scientists aiming to going beyond Z = 118, building up further neutron-rich nuclides and reaching the ultimate goal of creating long-living new elements at the edge of the Periodic Table.

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Synthesis and physical identification of the isotope with mass number 260 of element 104

Cited by 24 publications

References 1 publication

Analysis of Excitation Functions inCm(C,xn)NoReactions

Analysis of Excitation Functions inCm(C,xn)NoReactions

On-line gas chromatographic studies of Rf, Zr, and Hf bromides

The periodic table of the elements: the search for transactinides and beyond

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